I had my appendix out and notice (what I thought was scare tissue). I have been diagnosed with a hernia. I have been getting sick, when it is swollen?

Incarcerated hernia? I don't quite understand the question. Where did you notice this scar tissue? When you are having a bowel movement? If so it's unlikely scar tissue, possibly shedding of the lining of the intestines which isn't dangerous. If you have a hernia and are feeling pain or vomiting because of it then you need to see a doctor urgently because it could be an incarcerated hernia.